Nuclear power plant turbine bearing housing

Abstract

The application discloses a nuclear power plant steam turbine bearing box, which comprises a box body and a top cover, the box body is composed of a bottom plate and side plates, an oil cavity is formed in the box body, an arc-shaped groove for bearing receiving is arranged on the upper part of the box body, and an oil return pipe is arranged on the box body; wherein the four edges of the bottom plate are connected with the side plates respectively, a recess is formed by extending downward in the middle part of the bottom plate, and the height d of the recess is greater than 100 mm. The nuclear power plant steam turbine bearing box provided by the application is provided with the recess extending downward on the bottom plate, the depth of the bearing box body is deepened, the effective space of the oil cavity in the bearing box body is increased, the buffering capacity of the lubricating oil injection is strengthened due to the increase of the depth of the bearing box body, the air mixing is reduced, meanwhile, the distance between the liquid level and the rotating part of the bearing is increased, and the safety margin is increased; the effective space of the oil cavity in the bearing box body is increased, the heat dissipation effect of the lubricating oil is strengthened, thereby the steam turbine generator set with larger power can be adapted, and the lubrication and cooling requirements of the shaft system of the steam turbine generator set can be effectively met.

Description

Technical Field

[0001] This application relates to the field of nuclear power turbines, and more particularly to a bearing housing for a nuclear power plant turbine. Background Technology

[0002] As a crucial component of steam turbine generator sets, the bearing housing directly impacts the safe and economical operation of the unit. For heavier, low-speed steam turbines, each rotor is equipped with two independent radial bearings. With the increasing power of nuclear power turbines, the size of this type of turbine has also increased, leading to a greater demand for lubricating oil during operation. The two support bearings of adjacent rotors are arranged within the same bearing housing. After lubricating and cooling the bearings, the lubricating oil from both bearings flows into the bearing housing for heat dissipation and collection. The collected lubricating oil then returns to the main oil tank through the bearing housing return pipe, preparing for recirculation. However, as the power of nuclear power turbines increases, the temperature of the lubricating oil flowing from the bearings also rises. The existing bearing housing has limited effective space, resulting in poor lubricating oil heat dissipation. Furthermore, as the power of nuclear power turbines increases, a larger return oil volume is required, but the limited side area of ​​the existing bearing housing restricts the diameter of the return oil pipe, resulting in a smaller pipe diameter and thus limiting the return oil volume. Utility Model Content

[0003] To address one of the technical problems existing in the prior art, this application provides a nuclear power plant turbine bearing housing, which increases the depth of the bearing housing to increase the effective space of the bearing housing, increases the diameter of the return oil header to increase the return oil volume, and effectively meets the lubrication and cooling requirements of the turbine generator set shaft system.

[0004] A nuclear power plant turbine bearing housing according to a first aspect of this application includes a housing body and a top cover. The housing body is composed of a bottom plate and side plates. The side plates include a front side plate and a rear side plate arranged opposite to each other, and a left side plate and a right side plate arranged opposite to each other. An oil cavity is formed inside the housing body. An arc-shaped groove for receiving bearings is provided on the upper part of the housing body. An oil return pipe is provided on the housing body and the oil return pipe is connected to the oil cavity. The bottom plate is connected to the side plates on its four sides. A groove extends downward from the middle of the bottom plate and the height d of the groove is greater than 100mm.

[0005] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the arc-shaped groove is provided on the upper part of the front side plate and the rear side plate; the oil return pipe is provided on the left side plate or the right side plate.

[0006] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the oil return pipe is disposed on the left side plate, and the bottom plate extends downward at the connection of the left side plate to increase the area of ​​the side where the left side plate is located.

[0007] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the diameter of the return oil pipe is greater than 400 mm.

[0008] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the left side plate is provided with an outwardly protruding part, and the oil return pipe is located on the protruding part.

[0009] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the height of the side plate is 800-900mm.

[0010] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, the upper part of the top cover is arched to form an arc-shaped top, and an upper arc groove is provided on the top cover corresponding to the arc-shaped groove of the housing.

[0011] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, both the housing body and the top cover are made of steel.

[0012] According to the nuclear power plant turbine bearing housing provided in the first aspect of this application, a connecting pipe is connected to the oil return pipe, the connecting pipe is inclined downwards, and the inclination angle of the connecting pipe is 2.5°~4°.

[0013] This application has the following beneficial effects: The nuclear power plant turbine bearing housing provided in this application features a downwardly extending groove on the base plate, with a groove height d greater than 100mm. This increases the depth of the bearing housing and the effective space of the internal oil cavity. The increased depth enhances the buffering capacity during lubricant injection, reduces the contribution of lubricant foaming characteristics, and minimizes air mixing. Simultaneously, it increases the distance between the liquid level and the rotating parts of the bearing, thus increasing the safety margin. The larger effective space of the internal oil cavity enhances the heat dissipation effect of the lubricant, thereby adapting to larger power turbine generator sets and effectively meeting the shaft lubrication and cooling requirements of the turbine generator set.

[0014] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1This is a schematic diagram of the structure of a nuclear power plant turbine bearing housing according to an embodiment of this application; Figure 2 This is a left view of the turbine bearing housing in a nuclear power plant.

[0016] Explanation of icon numbers: 10. Box body, 11. Front side plate, 12. Left side plate, 13. Oil return pipe, 14. Top cover, 20. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0018] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the order of the steps or actions in the method description can be changed or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0019] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the objects being described and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0020] The following is in conjunction with the appendix Figures 1 to 2 The provided embodiments further illustrate the nuclear power plant turbine bearing housing proposed in this application.

[0021] Reference Figure 1 , Figure 2In some embodiments of this application, a nuclear power plant turbine bearing housing is provided, including a housing body 10 and a top cover 20. The housing body 10 is composed of a bottom plate 11 and side plates. The side plates include a front side plate 12 and a rear side plate arranged opposite each other, and a left side plate 13 and a right side plate arranged opposite each other. In some embodiments, the height of the side plates is 800-900mm to form a deeper housing body 10. An oil cavity is formed inside the housing body 10, and an arc-shaped groove for receiving the bearing is provided on the upper part of the housing body 10. An oil return pipe 14 is provided on the housing body 10, and the oil return pipe 14 connects to the oil cavity. The bottom plate 11 is connected to the side plates on its four sides, and a groove extends downward from the middle of the bottom plate 11 to form a groove with a height d greater than 100mm. The nuclear power plant turbine bearing housing provided in this application has a downwardly extending groove on the base plate 11, with the groove height d greater than 100mm. This increases the depth of the bearing housing 10 and the effective space of the oil cavity inside the bearing housing. The increased depth of the bearing housing 10 enhances the buffering capacity during lubricant injection, reduces the contribution of lubricant foam characteristics and reduces air mixing, and increases the distance between the liquid level and the rotating parts of the bearing, thus increasing the safety margin. The increased effective space of the oil cavity inside the bearing housing enhances the heat dissipation effect of the lubricant, thereby adapting to larger power turbine generator sets and effectively meeting the shaft lubrication and cooling requirements of the turbine generator set.

[0022] Furthermore, such as Figure 1 and Figure 2 As shown, in some embodiments of this application, arc-shaped grooves are provided on the upper part of the front side plate 12 and the rear side plate; the oil return pipe 14 is provided on the left side plate 13 or the right side plate. Providing the oil return pipe 14 on the side of the housing 10 does not obstruct the arrangement of multiple bearing housings, allowing the bearing housings to be arranged in one or more neat rows, while also providing more connection space for the oil return pipe 14 extending from the side.

[0023] Furthermore, such as Figure 1 and Figure 2 As shown, in some embodiments of this application, the oil return pipe 14 is disposed on the left side plate 13, and the bottom plate 11 extends downward at the connection point of the left side plate 13 to increase the area of ​​the side where the left side plate is located. Since the area of ​​the side where the left side plate 13 is located is increased, the diameter of the oil return pipe 14 can be appropriately increased to obtain a better oil return effect. Furthermore, in this application, the diameter of the oil return pipe 14 is greater than 400mm. Previously, the diameter of the oil return pipe 14 was limited by the area of ​​the left side plate 13, and the diameter was generally around 350mm, resulting in a low oil return volume and affecting the lubrication and heat dissipation effect of the turbine unit. However, the oil return pipe 14 of this application has a diameter greater than 400mm, effectively increasing the oil return volume and enhancing the lubrication and heat dissipation effect of the turbine unit.

[0024] Furthermore, such as Figure 1 and Figure 2As shown, in some embodiments of this application, the left side plate 13 is provided with an outwardly protruding protrusion, and the oil return pipe 14 is located on the protrusion. The protrusion can further increase the effective space inside the bearing housing and improve the heat dissipation effect of the lubricating oil inside. By placing the oil return pipe 14 on the protrusion, the position of the oil return pipe 14 can be better arranged, and it is more convenient to connect the oil return pipe 14 with an external pipe.

[0025] Furthermore, such as Figure 1 and Figure 2 As shown, in some embodiments of this application, the top cover 20 is arched at the top to form an arc-shaped top, and an upper arc groove is formed on the top cover 20 corresponding to the arc-shaped groove of the housing 10. The arc-shaped top and the upper arc groove can better match the shape of the bearing and will not hinder the normal operation of the bearing.

[0026] Furthermore, in some embodiments of this application, both the housing 10 and the top cover 20 are made of steel, which has excellent strength, high temperature resistance, and corrosion resistance, thereby increasing the service life of the bearing housing.

[0027] Furthermore, in some embodiments of this application, a connecting pipe is connected to the oil return pipe 14. The connecting pipe is inclined downwards at an angle of 2.5° to 4°. Previously, the inclination angle of the connecting pipe generally did not exceed 2°, resulting in low oil return efficiency. In this application, the inclination angle of the connecting pipe is increased to 2.5° to 4°, effectively increasing the oil return efficiency and improving the lubrication effect.

[0028] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A turbine bearing housing for a nuclear power plant, characterized in that, Includes a housing (10) and a top cover (20). The housing (10) is composed of a bottom plate (11) and side plates. The side plates include a front side plate (12) and a rear side plate arranged opposite to each other, as well as a left side plate (13) and a right side plate arranged opposite to each other. An oil cavity is formed inside the housing (10). An arc-shaped groove for receiving bearings is provided on the upper part of the housing (10). An oil return pipe (14) is provided on the housing (10) and the oil return pipe (14) is connected to the oil cavity. The bottom plate (11) is connected to the side plate on all four sides. The bottom plate (11) extends downward in the middle to form a groove, and the height d of the groove is greater than 100mm.

2. The nuclear power plant turbine bearing housing as described in claim 1, characterized in that, The arc-shaped groove is provided on the upper part of the front side plate (12) and the rear side plate; the oil return pipe (14) is provided on the left side plate (13) or the right side plate.

3. The nuclear power plant turbine bearing housing as described in claim 2, characterized in that, The return oil pipe (14) is disposed on the left side plate (13), and the bottom plate (11) extends downward at the connection of the left side plate (13) to increase the area of ​​the side where the left side plate is located.

4. The nuclear power plant turbine bearing housing as described in claim 3, characterized in that, The diameter of the return oil pipe (14) is greater than 400 mm.

5. The nuclear power plant turbine bearing housing as described in claim 3 or 4, characterized in that, The left side plate (13) is provided with an outward protrusion, and the oil return pipe (14) is located on the protrusion.

6. The nuclear power plant turbine bearing housing as described in claim 1, characterized in that, The height of the side plate is 800-900mm.

7. The nuclear power plant turbine bearing housing as described in claim 1, characterized in that, The top cover (20) is arched to form an arc-shaped top, and an upper arc groove is provided on the top cover (20) corresponding to the arc groove of the box body (10).

8. The nuclear power plant turbine bearing housing as described in claim 1, characterized in that, Both the box body (10) and the top cover (20) are made of steel.

9. The nuclear power plant turbine bearing housing as described in claim 1, characterized in that, The return oil pipe (14) is connected to a connecting pipe, which is inclined downwards and has an inclination angle of 2.5°~4°.

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